tsconfig.json

{
  // see https://www.typescriptlang.org/tsconfig to better understand tsconfigs
  "include": ["src", "types", "tsd.d.ts"],
  "exclude": ["node_modules", "lib"],
  "compilerOptions": {
    "target": "esnext",
    "module": "esnext",
    "lib": ["dom", "esnext"],
    "importHelpers": true,
    // output .d.ts declaration files for consumers
    "declaration": true,
    // output .js.map sourcemap files for consumers
    "sourceMap": true,
    // match output dir to input dir. e.g. dist/index instead of dist/src/index
    "rootDir": "./src",
    // stricter type-checking for stronger correctness. Recommended by TS
    "strict": false,
    // linter checks for common issues
    "noImplicitReturns": false,
    "noFallthroughCasesInSwitch": true,
    // noUnused* overlap with @typescript-eslint/no-unused-vars, can disable if duplicative
    "noUnusedLocals": false,
    "noUnusedParameters": true,
    // use Node's module resolution algorithm, instead of the legacy TS one
    "moduleResolution": "node",
    // transpile JSX to React.createElement
    "jsx": "react-jsx",
    // interop between ESM and CJS modules. Recommended by TS
    "esModuleInterop": true,
    // significant perf increase by skipping checking .d.ts files, particularly those in node_modules. Recommended by TS
    "skipLibCheck": true,
    // error out if import and file system have a casing mismatch. Recommended by TS
    "forceConsistentCasingInFileNames": true,
    "noEmit": true,
    // "jsxImportSource": "@emotion/react",
    // From header
    // "target": "ESNext",
    // "useDefineForClassFields": true,
    // "lib": ["DOM", "DOM.Iterable", "ESNext"],
    // "allowJs": false,
    // "skipLibCheck": true,
    // "esModuleInterop": false,
    // "allowSyntheticDefaultImports": true,
    // "strict": false,
    // "forceConsistentCasingInFileNames": true,
    // "module": "ESNext",
    // "moduleResolution": "Node",
    // "resolveJsonModule": true,
    "isolatedModules": true,
    // "noEmit": true,
    // "jsx": "react-jsx"
    "types": ["node", "jest", "@testing-library/jest-dom"]
  },
  "references": [{ "path": "./tsconfig.node.json" }]
}